#include <stdio.h>


int main(int argc, char const *argv[])
{

    // ======================= 一级指针指向 二维数组 =======================
    int * ptr = NULL;
    double * ptr_dou = NULL;
    printf("int * %ld\n" , sizeof(ptr));
    printf("double * %ld\n" , sizeof(ptr_dou));
 

    char * User_Data[5][2];
    printf("User_Data %ld\n" , sizeof(User_Data)); // 80

    return 0;
}




